One of the things that caught my attention when my wife and I were considering homeschooling was that homeschooled kids out-perform their peers at every academic stage. There are a number of good studies on this (
link).
But the your points in the above quote were key in our decision not to homeschool. It goes to the whole EQ/IQ thing that Daniel Goleman and many others have done some very extensive work.
The claim (with which I agree) is that something like 75% of a person's (or even a group's) success in life is attributable to and correlated with "soft" skills such as the ability to empathize with others, to be flexible and adapt, to negotiate and compromise, to resolve conflict and leverage diversity, to learn (and then coach, mentor and lead), and so on..
These are all things that can't be taught through cognitive exercises or rote learning. They're not things that we can easily measure and test for, either. So what has historically happened in most structured environments (like schools or a place of work), is that soft-skills are de-emphasize and compensations are made by putting more weight on cognitive intelligence, academic achievement, and becoming "book" smart.